4 - 6 задание 55б даю!!!!!!!. Created by rootkryt12. matematika-ru

4 - 6 задание 55б даю!!!!!!!...

rootkryt12 @rootkryt12

August 2022 1 9 Report

4 - 6 задание 55б даю!!!!!!!

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IrkaShevko

Verified answer

4.
(a - 2)(a² + a + 4) = (a - 2)(a² + 2a + 4 - a) =

a³ - 8 - a(a-2) = a³ - a² + 2a - 8 = a³ - (a² - 2a + 8)

a² - 2a + 8
D = 4 - 32 < 0
=> a² - 2a + 8 > 0 ∀a

a³ - (a² - 2a + 8) < a³ ∀a

Ответ: доказано

5.
bc > 1*3 = 3
3bc > 3*3 = 9
2a + 3bc > 2*5 + 9 = 19 > 15

Ответ: доказано

6. решаем методом интервалов:

а) ____+____(8/3)_____-_____
x∈(-∞; 8/3)

б) (2x + 10 - 4 - 3x + 7)/4 ≤ 0
(-x +13)/4 ≤ 0
____+____[13]______-_______
x∈ [13; +∞)

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rootkryt12 Что за перевёрнутая А?

IrkaShevko любое

Answers & Comments

Verified answer

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